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Mobility of photosynthetic complexes in thylakoid membranes

Author

Listed:
  • Conrad W. Mullineaux

    (University College London)

  • Mark J. Tobin

    (CLRC Daresbury Laboratory)

  • Gareth R. Jones

    (CLRC Daresbury Laboratory)

Abstract

The structures of many photosynthetic pigment–protein complexes have now been determined1,2,3,4,5,6, but a real understanding of the photosynthetic membrane at the molecular level will also require knowledge of the organization and dynamics of these complexes in the intact membrane. Using fluorescence recovery after photobleaching (FRAP)7 and a scanning confocal microscope, we have made direct measurements in vivo of the lateral diffusion of light-harvesting complexes and reaction centres in the thylakoid membranes of the cyanobacterium Dactylococcopsis salina8. We find that the phycobilisomes (the accessory light-harvesting complexes of cyanobacteria) diffuse quite rapidly, but that photosystem II is immobile on the timescale of the measurement, indicating that the linkage between phycobilisomes and photosystem II is unstable. We propose that the lateral diffusion of phycobilisomes is involved in regulation of photosynthetic light-harvesting (state 1–state 2 transitions). The mobility of the phycobilisomes may also be essential to allow the synthesis and repair of thylakoid membrane components.

Suggested Citation

  • Conrad W. Mullineaux & Mark J. Tobin & Gareth R. Jones, 1997. "Mobility of photosynthetic complexes in thylakoid membranes," Nature, Nature, vol. 390(6658), pages 421-424, November.
    • Handle: RePEc:nat:nature:v:390:y:1997:i:6658:d:10.1038_37157
    DOI: 10.1038/37157
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    Cited by:

    1. Minchul Kang & Manuel Andreani & Anne K Kenworthy, 2015. "Validation of Normalizations, Scaling, and Photofading Corrections for FRAP Data Analysis," PLOS ONE, Public Library of Science, vol. 10(5), pages 1-28, May.
    2. Mengru Yang & Nicolas Wenner & Gregory F. Dykes & Yan Li & Xiaojun Zhu & Yaqi Sun & Fang Huang & Jay C. D. Hinton & Lu-Ning Liu, 2022. "Biogenesis of a bacterial metabolosome for propanediol utilization," Nature Communications, Nature, vol. 13(1), pages 1-16, December.
    3. Xing Zhang & Yanan Xiao & Xin You & Shan Sun & Sen-Fang Sui, 2024. "In situ structural determination of cyanobacterial phycobilisome–PSII supercomplex by STAgSPA strategy," Nature Communications, Nature, vol. 15(1), pages 1-11, December.

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